What does salicylic acid do for skin?

What salicylic acid does

Salicylic acid is a keratolytic, a medicine that softens and loosens outer skin cells. In acne, it reduces swelling and redness, unplugs blocked pores, and slows the shedding of cells inside hair follicles. It helps break down the plugs that become blackheads and whiteheads, so it suits clogged bumps better than large, painful pimples deep under the skin.13

Outside acne, topical salicylic acid is used for scaling conditions such as psoriasis and dandruff, and for thickened spots such as corns, calluses, and certain warts. Products come in many forms and strengths, and the right form and strength depend on the condition being treated. Listed topical strengths range from 0.5% to 30% across different uses, not as a strength ladder for everyday facial care. At strengths ranging from 0.5% to 30% across different uses, the number is not a skincare high score.34

How to use salicylic acid for acne

Salicylic acid comes in cleansers, lotions, creams, gels, liquids, ointments, pads, shampoos, and patches. Choose a product meant for the area and condition you are treating, then follow that product's directions for amount, contact time, and frequency.3

1. 1If you have not used the product before, apply a small amount to one or two small areas for three days. If there is no reaction or discomfort, continue as directed on the label.
2. 2For acne, spread a thin layer over the whole acne prone area rather than dabbing only on visible blemishes.
3. 3Apply it only to affected skin, not to skin that is broken, red, swollen, irritated, or infected. Keep it out of your eyes, nose, and mouth.
4. 4If your skin gets dry or irritated, use the product less often. A water based, noncomedogenic moisturizer can help with dryness, but those labels do not guarantee that a product will suit every person.
5. 5Do not use abrasive cleansers, alcohol based products, benzoyl peroxide, or topical retinoids on the same treated area unless your doctor directs you to. Combining them can irritate the skin.

Some dryness, irritation, or stinging can happen, especially early in use. Skin can also seem worse during the first few days as it adjusts. Full benefit from topical salicylic acid can take several weeks or longer. For acne medicines that work, the AAD gives a general benchmark of fewer breakouts in four to eight weeks and clearing by 16 weeks; those are broad acne timelines, not a promise about salicylic acid alone. The AAD advises using one active product as directed for six to eight weeks before adding another. Acne treatment runs on weeks, so salicylic acid is a poor same day delivery service.23

How often to use salicylic acid

There is no single schedule for every salicylic acid product: topical use can range from several times a day to several times a week, depending on the product and condition. Follow the label rather than borrowing a schedule from another formula. The exact morning or evening time is also product specific, so let its label set it. For one narrow example, the AAD describes a twice daily salicylic acid cleanser routine for beard acne; that schedule is for a gentle face wash in that situation, not every salicylic acid product.36

Salicylic acid for blackheads

Salicylic acid is a good match for blackheads because it helps reduce the dead skin and cell buildup that clogs follicles, and helps break down the plugs themselves. Blackheads are open pores filled with oil and dead skin; their dark appearance comes from light reflecting off the clog, not from dirt. Cleveland Clinic lists salicylic acid in cleanser or lotion form as an over the counter option for blackheads. Squeezing can push a plug deeper, irritate the skin, or cause scarring, so loosening the clog with a product is a less forceful approach than trying to extract it with your nails.17

Who should take care

Salicylic acid can irritate or sting skin, and acne products can cause dryness or peeling. If your skin becomes irritated, reduce how often you use it; do not apply it to skin that is already broken, red, swollen, irritated, or infected. Tell a doctor or pharmacist about medicines, vitamins, and supplements you take, especially before combining salicylic acid with other topical acne products. If you are pregnant, trying to become pregnant, or breastfeeding, ask a dermatologist or doctor before treating acne on your own. People with diabetes or blood vessel, kidney, or liver disease should also tell their doctor before using topical salicylic acid.23

When to stop or get medical help

Stop using salicylic acid and get medical help immediately for hives, throat tightness, trouble breathing, faintness, or swelling of the face, lips, or tongue. Contact a doctor if irritation is severe or does not go away, or if you develop unusual symptoms such as confusion, dizziness, ringing in the ears, nausea, or vomiting. For acne, seek a dermatologist's help for large, painful pimples deep under the skin, scarring, worsening acne, or acne that has not improved after several months of self care and over the counter products.35